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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde1bedf166879f22e364de02f9a4f6f7d82d639a425533018f1fd7e91beb4d5' 
  AND token = 'y/lBlcg4qGfahhe9ZQQKya6HOuIjiyQn4sbfuDyb3jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}